Pipes!!!

Hi everyone!

I hope you are warmer than I. My 1920 Colonial is living through the deep freeze covering huge swatches of the US, and I have one hot water supply pipe still stubbornly frozen after all of the others have gone back to normal.

It's inaccessible and runs through an exterior wall; there is a hatch which connects to that wall about 3 feet away from the tub spout in the next room.

I've had a space heater pointed directly into that hatch with the room's door closed (to keep me from freezing!) for about 10 hours.

The hot tap is open a wee bit (but no dripping).

Any other ideas?

I am NOT seeing any leakage in the basement below.

Thanks in advance!